D=12 a²+(a√2)²=12² a²+2a²=144 3a²=144 /:3 a²=48 a=4√3cm P=6a²=6*48=288cm²
a teraz?
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D=12
a²+(a√2)²=12²
a²+2a²=144
3a²=144 /:3
a²=48
a=4√3cm
P=6a²=6*48=288cm²
a teraz?